// 实现这个项目的构建任务
const { src, dest, series, parallel, watch } = require('gulp');
const del = require('del')
const browserSync = require('browser-sync')
const loadPlugins = require('gulp-load-plugins')

const plugins = loadPlugins() // 加载全部插件
const bs = browserSync.create()

const data = {
    menus: [
      {
        name: 'Home',
        icon: 'aperture',
        link: 'index.html'
      },
      {
        name: 'Features',
        link: 'features.html'
      },
      {
        name: 'About',
        link: 'about.html'
      },
      {
        name: 'Contact',
        link: '#',
        children: [
          {
            name: 'Twitter',
            link: 'https://twitter.com/w_zce'
          },
          {
            name: 'About',
            link: 'https://weibo.com/zceme'
          },
          {
            name: 'divider'
          },
          {
            name: 'About',
            link: 'https://github.com/zce'
          }
        ]
      }
    ],
    pkg: require('./package.json'),
    date: new Date()
}

const clean = () => {
    return del(['dist', 'temp'])
}

const style = () => {
    return src('src/assets/styles/*.scss', { base: 'src' })
        .pipe(plugins.sass({ outputStyle: 'expanded' }))
        .pipe(dest('temp'))
        .pipe(bs.reload({ stream: true }))
}

const script = () => {
    return src('src/assets/scripts/*.js', { base: 'src' })
        .pipe(plugins.babel({ presets: ['@babel/preset-env'] }))
        .pipe(dest('temp'))
        .pipe(bs.reload({ stream: true }))
}

const image = () => {
    return src('src/assets/images/**', { base: 'src' })
        .pipe(plugins.imagemin())
        .pipe(dest('dist'))
}

const font = () => {
    return src('src/assets/fonts/**', { base: 'src' })
        .pipe(dest('dist'))
}

const public = () => {
    return src('public/**', { base: 'public' })
        .pipe(dest('dist'))
}

const html = () => {
    return src('src/**/*.html', { base: 'src' })
        .pipe(plugins.swig({ data, defaults: { cache: false } }))
        .pipe(dest('temp'))
        .pipe(bs.reload({ stream: true }))
}

const serve = () => {
    watch('src/assets/styles/*.scss', style)
    watch('src/assets/scripts/*.js', script)
    watch('src/**/*.html', html)
    watch([
        'src/assets/images/**',
        'src/assets/fonts/**',
        'public/**'
    ], bs.reload)

    bs.init({
        notify: false,
        port: 3000,
        open: true,
        // files: 'dist/**'
        server: {
            baseDir: ['temp', 'src', 'public'],
            routes: {
                '/node_modules': 'node_modules'
            }
        }
    })
}

const useref = () => {
    return src('temp/*.html', { base: 'temp' })
        .pipe(plugins.useref({ searchPath: ['temp', '.'] }))
        .pipe(plugins.if(/\.js$/, plugins.uglify()))
        .pipe(plugins.if(/\.css$/, plugins.cleanCss()))
        .pipe(plugins.if(/\.html$/, plugins.htmlmin({
            collapseWhitespace: true,
            minifyCSS: true,
            minifyJS: true
        })))
        .pipe(dest('dist'))
}

const compile = parallel(style, script, html)

const develop = series(compile, serve)

const build = series(
    clean,
    parallel(
        series(compile, useref),
        image,
        font,
        public,
    )
)

module.exports = {
    clean,
    develop,
    build
}